The rescript package provides the rescript-tools executable:

npm install --save-dev rescript

rescript-tools --help

Print JSON:

rescript-tools doc src/EntryPointLibFile.res

Write JSON:

rescript-tools doc src/EntryPointLibFile.res > doc.json

rescript-tools reanalyze --help

• Migration framework capabilities
• Reanalyze architecture

RescriptTools.Docgen in the standard library (@rescript/runtime) decodes the JSON that rescript-tools doc prints:

// Read JSON file and parse with `JSON.parseOrThrow`
json->RescriptTools.Docgen.decodeFromJson